EP2807280A1 - Procédé d'affinement d'un revêtement métallique sur une bande d'acier - Google Patents

Procédé d'affinement d'un revêtement métallique sur une bande d'acier

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Publication number
EP2807280A1
EP2807280A1 EP13701956.8A EP13701956A EP2807280A1 EP 2807280 A1 EP2807280 A1 EP 2807280A1 EP 13701956 A EP13701956 A EP 13701956A EP 2807280 A1 EP2807280 A1 EP 2807280A1
Authority
EP
European Patent Office
Prior art keywords
coating
steel strip
melting
strip
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13701956.8A
Other languages
German (de)
English (en)
Other versions
EP2807280B1 (fr
Inventor
Dirk Matusch
Reiner Sauer
Helmut Oberhoffer
Rainer Thomas
Markus Opper
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Rasselstein GmbH
Original Assignee
ThyssenKrupp Rasselstein GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by ThyssenKrupp Rasselstein GmbH filed Critical ThyssenKrupp Rasselstein GmbH
Publication of EP2807280A1 publication Critical patent/EP2807280A1/fr
Application granted granted Critical
Publication of EP2807280B1 publication Critical patent/EP2807280B1/fr
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • C25D5/50—After-treatment of electroplated surfaces by heat-treatment
    • C25D5/505—After-treatment of electroplated surfaces by heat-treatment of electroplated tin coatings, e.g. by melting
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/60—Continuous furnaces for strip or wire with induction heating
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/08—Tin or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C23C2/285—Thermal after-treatment, e.g. treatment in oil bath for remelting the coating
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C23C2/29—Cooling or quenching
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • C23C2/405—Plates of specific length
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
    • H05B6/103—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor
    • H05B6/104—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor metal pieces being elongated like wires or bands
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the invention relates to a method for refining a metallic coating on a steel strip or steel sheet according to the preamble of claim 1 and to a device for applying a metallic coating to a steel strip, in particular a strip tin plating line, according to the preamble of claim 10.
  • the melting of the coating can be done for example by inductive heating of the coated steel strip.
  • DE 1 186 158-A is, for example, an arrangement for inductive heating of metallic strips for the melting of particular electrolytically applied coatings, such as tin layers on steel strips, known.
  • This arrangement comprises a plurality of rollers over which the coated tape is passed, as well as a plurality of inductive coils arranged in series and surrounding the moving belt, which inductively heats the coated tape to temperatures above the melting temperature of the coating material to reflow the coating.
  • additional inductors with linear heating conductors are arranged at the strip edges of the coated strip.
  • This measure is intended to prevent the temperature of the coated strip with the induction coils from having to be heated to temperatures well above the melting temperature of the coating material in order to uniformly melt the coating over the entire width of the strip.
  • This should turn the Formation of an alloy intermediate layer can be avoided, which is composed of iron atoms and atoms of the coating material, for example, tin together.
  • the present invention seeks to provide a method and apparatus for finishing a metallic coating on a steel strip or sheet, which allow compared to the known methods and devices, a much more energy-efficient treatment of the coated steel strip.
  • the method and the device should also achieve an increased corrosion stability of the coating treated according to the invention, even with thin coating layers.
  • the metallic coating is expediently melted over its entire thickness by heating to a temperature above the melting temperature of the coating material, wherein the heating by electromagnetic induction by means of an induction furnace with at least one induction coil or an inductor.
  • the maximum temperature of the coating achieved is referred to below as the maximum temperature.
  • the temperature of the coating is maintained at a temperature above the melting temperature of the coating material over a holding time before quenching the coated steel strip in a cooler to a quench temperature below the melting temperature.
  • the holding time is considered to be the time span in which the temperature of the coating is above the melting temperature of the coating material.
  • the hold time is doing by moving at least one of the induction coils relative to the cooling device to the other process parameters, in particular the maximum temperature, the belt speed and the thickness of the coating, adapted to completely melt the coating over its entire thickness to the boundary layer to the steel strip.
  • the process parameters can be coordinated so that the coating (substantially exactly) is melted over its entire thickness to the boundary layer to the steel strip, without the underlying steel strip is substantially heated.
  • the inventively provided displacement of at least one of the induction coils relative to the cooling device thereby allows the adaptation of the holding time to the (speed determined by the production process in the galvanic coating process) belt speed and the thickness of the coating applied in the coating process. The latter is suitably detected at the end of the coating device by means of suitable thickness sensors.
  • the preferred holding times are in the range of 150 ms to 800 ms at the typical belt speeds of belt tinning systems (which move between 300 m / min and 700 m / min). In order not to deteriorate the ductility of the strip, it is preferable to set the hold time as low as possible (without, however, setting the maximum temperature to values above 360 ° C.).
  • the energy input caused by the electromagnetic induction preferably takes place essentially in the coating to be melted and in the uppermost layers of the underlying steel strip.
  • the penetration depth of the induction current can be controlled via the operating frequency of the induction coil or the inductor.
  • the range of applicable at the required induction power frequencies is in the range of high frequency (50 kHz to 1 MHz, preferably frequencies in the range of 150 kHz to achieve penetration depths in the range 10 to 100 ⁇ .
  • the coated steel strips have particularly good values for their corrosion resistance when the metallic coating is inductively heated to a maximum temperature of more than 310 ° C in order to melt the coating over the holding time.
  • Particularly advantageous is the range of 310 ° C to 360 ° C and more preferably the range of 320 ° C to 350 ° C for the maximum temperature has been found.
  • the deformability of the present invention treated strips or sheets deteriorates due to a reduction in the yield strength.
  • the process parameters for the inductive melting of the coating are expediently chosen and adapted to the belt speed and the thickness of the coating, that only a part of the coating with the iron atoms of the steel strip or steel sheet alloyed and therefore after the melting still unalloyed coating and underlying a thin alloy layer is present.
  • the thickness of the alloy layer corresponds approximately to a basis weight or an overlay of only 1.3 g / m 2 or less.
  • alloy layers which are thinner than 1.0 g / m 2 have proved to be particularly suitable, and alloy layers having a thickness in the range from 0.05 to 0.6 g / m 2 have proved to be particularly preferred ,
  • the formability of the coated steel sheet deteriorates, for example, for the production of beverage or cans.
  • the method according to the invention it can be ensured that, for example, in the case of tinning of sheet steel, a thin and at the same time substantially pore-free and thus very dense alloy layer is achieved even with thin total tin deposits of 1.0 g / m 2 or less with a visually appealing (ie glossy) coating surface ,
  • the very thin and at the same time dense alloy layer compared to the thickness of the coating leads to an increased corrosion resistance of the coated steel and to an improved adhesion of the coating to the steel strip or sheet.
  • this is made possible by the fact that the process parameters during melting of the coating can be adapted to each other in order to make a targeted adjustment of the thickness of the forming during the melting of the coating alloy layer.
  • the thickness of the forming alloy layer is decoupled from the fixed distance in the previous method between the melting device and the cooling device.
  • the distance of the induction coil to the cooling device is suitably continuously adjustable to adjust the hold time to a desired value.
  • the holding time to the other process parameters, such as the maximum temperature and the thickness of the deposited on the steel strip coating, the thickness of the alloy layer and thus ultimately the material properties of the coated steel strip, such as its corrosion resistance and formability, can be controlled. The best results were achieved when the maximum temperature on values between 310 ° C and 360 ° C and the hold time between 0.1 s and 1.0 s and preferably between 0.2 s and 0.3 s has been set.
  • the object underlying the invention is further achieved with a device for applying a metallic coating on a steel strip.
  • an endless steel belt is moved at a belt speed in a belt running direction and electrolytically provided with a metallic coating in a coating device.
  • the device may in particular be a strip-tinning plant with an electrolytic coating device in which the steel strip is moved at the strip speed through a tin-containing electrolyte in order to obtain a Deposit tin layer on the steel strip.
  • the strip running direction of the coating device downstream of a melting device, in which the coating is melted by inductive heating to a maximum temperature above the melting temperature of the material of the coating.
  • the melting device is arranged downstream of a cooling device in the strip running direction, in which the coated steel strip is cooled to a quenching temperature below the melting temperature.
  • the melting device is displaceable relative to the cooling device in order to be able to set the distance between the melting device and the cooling device in the direction of travel of the strip to a desired value.
  • the melting device comprises at least one induction coil movably arranged in the direction of travel of the strip.
  • the melting device may also contain other induction coils, which are arranged in the strip running direction one behind the other. These additional induction coils can be fixed locally with respect to the cooling device or also be displaced. It is expedient, however, in an arrangement of a plurality of induction coils connected in series, at least the last induction coil, which is closest to the cooling device, or to make the entire coil arrangement displaceable.
  • the induction coil (s) the coated steel strip can be inductively heated to the maximum temperature in adjustable heating rates.
  • the cooling device may be one with a cooling fluid, e.g. Water, filled quota tank act.
  • a cooling fluid e.g. Water
  • another cooling device e.g. a blower or gas cooling, in particular an air cooling, are used.
  • Figure 1 a schematic representation of a device for applying a metallic coating on a steel strip; schematic representation of the melting device and the cooling device of the device of Figure 1;
  • the device shown schematically in FIG. 1 is, for example, a strip-tinning plant with a coating device in which a tin coating is deposited on a fine or ultra-fine plate by passing the steel strip through a tin-containing electrolyte at a strip speed VB.
  • the invention may similarly be applied, for example, in processes for the electrolytic coating of steel strips with other metals, e.g. Zinc, used to produce so-called. Special galvanized Feinstblech.
  • the application of the method according to the invention is not limited to the coating of steel strips in strip-tinning systems, but can be used in a corresponding manner, for example. Also in the dip coating of steel sheets in the form of sheets, in which the metal coating is not applied electrolytically to the steel strip.
  • the strip-tinning system for the electrolytic tinning of sheet steel shown schematically in FIG. 1, comprises an unwinding group 10, in which a steel strip cold-rolled into a fine or ultra-fine sheet is drawn from a roll (coil) and welded together to form an endless steel strip in a welding device 11.
  • the endless belt is fed into a loop tower 12 to form a belt supply.
  • the tape supply taken up by the loop tower 12 also allows for a continuous passage of the strip through the strip-tinning system at a predetermined strip speed during the necessary standstill times when welding together or later when separating the coated steel strip and rolling on completely wound coils.
  • the loop tower 12 is followed by a pretreatment device 13 and a coating device 4.
  • the coating device 4 will move the strip moving at the strip speed (VB) through the strip dipping line through a tin-containing electrolyte to deposit a layer of tin on the steel strip.
  • a melting device 5 in which the coating deposited on the steel strip to temperatures above the melting temperature of the coating material (this is at 232 ° C tin) is heated to melt the deposited coating.
  • the melting device 5 is followed by a cooling device 3 and an aftertreatment device 14 and a second loop tower 15. Finally, the coated steel strip is wound up in a winding group 16 on coils.
  • the still uncoated steel strip coming from the first loop tower 12 is first subjected to a pretreatment in the pretreatment device 13 before it is provided with a tin layer in the coating device 4.
  • the uncoated steel strip is first degreased and then pickled.
  • the still uncoated steel strip with the belt speed (VB) through an alkaline degreasing, eg. A sodium carbonate or sodium hydroxide solution passed.
  • the degreasing bath is to be cleaned at regular intervals of contamination caused by grease and iron abrasion.
  • the bath slurry (bath extinction) of the degreasing bath has an extinction value of ⁇ 1 (according to the Lambert's method) with an optical measurement with light at a wavelength of 535 nm. Beer law, corresponding to a light attenuation of less than a factor of 10).
  • acidic solution eg. In a sulfuric acid solution
  • pickled and rinsed again it is expedient if the steel strip is rinsed after degreasing and pickling with a rinsing liquid, which preferably has a conductivity of ⁇ 20 ⁇ 8 / ⁇ .
  • the degreased and pickled steel strip is passed through a tin-containing electrolyte bath and connected there as a cathode and passed between two rows of tin anodes.
  • the tin of the anodes is dissolved and deposited on the steel strip as a tin coating.
  • the tin can be of any thickness and, if necessary, on both Sides of the steel strip are applied.
  • the thickness of the applied tin layer is regularly between 1.0 g / m 2 and 5.6 g / m 2 .
  • the refining process is carried out in the melting device 5 and the cooling device 3 connected downstream thereof in the strip running direction. The details of the finishing process according to the invention and the devices used therefor will be described in detail below with reference to FIGS. 2 and 3.
  • FIG. 2 schematically shows the melting device 5 and the cooling device 3 arranged downstream in the direction of travel of the strip.
  • the moving at the belt speed steel belt is guided over deflection rollers 19 and passed into the melting device 5 and from there into the cooling device 3.
  • the moving steel strip runs essentially vertically in a top-down direction, as shown in FIG.
  • the melting device 5 is an induction furnace with at least one induction coil 2.
  • the induction furnace may also comprise a plurality of induction coils or inductors arranged one behind the other in the direction of strip travel. In the following, it is assumed that the induction furnace contains only one induction coil 2.
  • the induction coil 2 is supplied with alternating electrical current, preferably in the high frequency range (50 kHz to 30 MHz), and the coated steel strip 1 is moved through the induction coil 2 at the belt speed (VB). As a result, eddy currents are induced in the coated steel strip, which heat the coated steel strip.
  • the coated steel strip in the induction furnace is heated to temperatures above the melting temperature of the coating material (Ts, this being 232 ° C. at tin).
  • Ts melting temperature of the coating material
  • the maximum temperature reached is referred to as the maximum temperature (PMT). It has been found that maximum temperatures which are higher than 310 ° C. and preferably in the range between 320 ° C. and 350 ° C. are to be preferred for carrying out the inventive finishing process.
  • the maximum temperature can be controlled by the power of the induction coil 2.
  • the penetration depth of the generated by electromagnetic induction Induction current into the surface of the coated steel strip may be controlled by the frequency of the alternating electromagnetic current applied to the induction coil 2.
  • the power required for carrying out the refining process according to the invention the induction coil 2 are in the range of 1500 to 2500 kW.
  • the coated steel strip can be heated to temperatures above the melting temperature Ts of the coating material at heating rates between 600 K / s and 1300 K / s.
  • the heating rates of the induction furnace are expediently set between 900 K / s and 1100 K / s.
  • the melting device 5 induction furnace or the induction coil 2 extends in the strip running direction between the coil inlet 2a and the coil outlet 2b over a length L, which is suitably in the range of 2 to 3m.
  • This length L represents the effective heating zone in which the coated steel strip in the reflow device 5 is heated.
  • the melting device 5 is followed by a cooling device 3 in the strip running direction and at a distance from the melting device 5.
  • the cooling device 3 comprises a quenching tank 6 filled with a cooling liquid.
  • a further deflection roller 19 is arranged, via which the quenched steel strip is guided out of the cooling device 3.
  • the liquid level of the cooling liquid is indicated by reference numeral 7 in FIG.
  • the molten coating between the melting device 5 and the cooling device 3 cools slightly due to heat conduction and convection.
  • the molten coating still remains in its molten state on its way between the reflow device 5 and the cooling device 3.
  • the entire melting device 5 or at least one induction coil 2 arranged therein is displaceable relative to the cooling device 3 to the distance D between the coil output 2b and the input of the cooling device 3, in particular the liquid level 7, to a desired and for the Implementation of the method according to the invention to adjust appropriate value.
  • the entire melting device 5 or at least its induction coil 2 is movably arranged in a frame 8, as shown in Figure 3.
  • the entire melting device 5 is arranged on the frame 8 so that it can be moved continuously in the direction of tape travel.
  • a reflow device 5 with an induction coil row is preferably at least the last seen in the strip running direction induction coil (ie adjacent to the cooling device 3) induction coil displaceable in the strip running direction to their distance from the adjacent cooling device 3 to be set to a suitable value.
  • the appropriate distance between the melting device 5 and the (last) induction coil of an induction coil row is determined so that the coating is melted so just over its entire thickness up to the boundary layer to the steel strip without thereby (by the electromagnetic induction) excess energy in to apply the coating.
  • FIG. 3 shows the frame 8 with the melting device 5 (induction furnace) arranged thereon.
  • the melting device 5 in this case comprises a housing 9, in which the induction coil 2 is arranged.
  • the housing 9 is slidably mounted on the frame 8 via slide rails movable between an upper end position 2c and a lower end position 2d.
  • the displacement of the frame 9 is expediently via a motor drive.
  • the coating it is possible for the coating to be melted (straight) over its entire thickness up to the boundary layer to the steel strip. It has been found that melting the coating to the boundary layer to the steel strip is very advantageous, because at the boundary layer between the coating and the steel strip a thin and at the same time very dense alloy layer is formed compared to the thickness of the coating.
  • This alloy layer consists of iron atoms of the steel strip and of the atoms of the coating material (ie, for example, in a tin coating of tin and iron atoms, in the stoichiometry FeSn 2 ).
  • the formation of this alloy interlayer has significant effects on the properties of the coated steel strip. In particular, the formation of the alloy layer increases the corrosion resistance of the coated steel strip and improves the adhesion of the coating to the steel strip.
  • tinplates produced by conventional methods were compared with tinplates which have been refined by the method according to the invention.
  • coated tinplates were treated according to the invention with a tin coating of 2.0 to 8.6 g / m 2 , wherein in one exemplary embodiment the inductive melting of the coating set a heating rate of 963 ° C./s and a maximum temperature (PMT) of 330 ° C. has been.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Electrochemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne un procédé d'affinement d'un revêtement métallique sur une bande d'acier (1) ou tôle d'acier, le revêtement étant ramolli par chauffage inductif au moyen d'au moins une bobine d'induction (2) à une température maximale (PMT) supérieure à la température de fusion (TS) du matériau du revêtement et étant ensuite refroidi dans un dispositif de refroidissement (3) à une température de trempe (TA) inférieure à la température de fusion. Selon l'invention, pour améliorer la stabilité à la corrosion du revêtement traité selon l'invention même pour de minces couches de revêtement, le revêtement est maintenu à une température supérieure à la température de fusion (TS) pendant un temps de garde (th) et ce dernier (th) est adapté, par déplacement d'au moins une des bobines d'induction (2) par rapport au dispositif de refroidissement (3), à la température maximale (PMT) et à l'épaisseur du revêtement pour fondre complètement le revêtement sur toute son épaisseur jusqu'à l'interface avec la bande d'acier.
EP13701956.8A 2012-01-23 2013-01-22 Procédé d'affinement d'un revêtement métallique sur une bande d'acier Revoked EP2807280B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012100509.5A DE102012100509B4 (de) 2012-01-23 2012-01-23 Verfahren zum Veredeln einer metallischen Beschichtung auf einem Stahlband
PCT/EP2013/051077 WO2013110577A1 (fr) 2012-01-23 2013-01-22 Procédé d'affinement d'un revêtement métallique sur une bande d'acier

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AU (1) AU2013211694B2 (fr)
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DE (1) DE102012100509B4 (fr)
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US10925804B2 (en) 2017-10-04 2021-02-23 Sundance Spas, Inc. Remote spa control system
CN109609747B (zh) * 2018-12-11 2022-01-25 信达科创（唐山）石油设备有限公司 一种连续油管的均质处理工艺

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CA2858292A1 (fr) 2013-08-01
BR112014016377A2 (pt) 2017-06-13
DE102012100509A1 (de) 2013-07-25
AU2013211694A1 (en) 2014-07-03
AU2013211694B2 (en) 2015-08-20
DE102012100509B4 (de) 2015-10-08
EP2807280B1 (fr) 2016-04-06
PT2807280T (pt) 2016-07-13
PL2807280T3 (pl) 2016-10-31
JP2015509144A (ja) 2015-03-26
CN104066859A (zh) 2014-09-24
ES2573835T3 (es) 2016-06-10
RU2014132568A (ru) 2016-03-20
CA2858292C (fr) 2016-09-20
US20150001089A1 (en) 2015-01-01
CN104066859B (zh) 2016-04-06
RU2590787C2 (ru) 2016-07-10
BR112014016377A8 (pt) 2017-07-04
WO2013110577A1 (fr) 2013-08-01

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